Toyota has sold about 100 Prius liftbacks per month in Quebec recently, and we'll learn the ratio of Prius liftback to Prius Prime sales when June’s vehicle registration data arrives.

It would not be surprising if the Prius Prime “cannibalized” many of its cousin’s sales, however, as the $4,000 point-of-sale rebate in the province means it is competitively priced against the conventional hybrid.

From Toyota’s website, the base Prius liftback has an all-in price of about $29,400 while the Prius Prime starts near $35,200 ($31,200 post-rebate) while the Prius liftback Technology package comes in around $32,600.

The Prius Prime should quality for a rebate of almost $7,400 in Ontario, which would in fact make it cheaper than the regular hybrid.

The purchase prices would probably run on the order of $29,000 for the Prius Liftback and $27,200 (post-rebate) for the Prius Prime, raising the question of whether anyone would purchase the regular hybrid.

(Consumers needing more seating or trunk space could just as easily purchase the RAV4 Hybrid crossover utility vehicle or Prius V wagon, instead.)

This cost competitiveness could actually be slowing the Prius Prime’s rollout across Canada, as the company needs to ensure it can handle demand as it expands to other provinces.

The Chevy Volt won its umpteenth monthly Canadian plug-in electric vehicle sales title in June, selling 347 units, down slightly from 404 in May.

GM has reported 1,998 sales at the halfway point of the year, so an annual total of 4,000-sale year may be in reach. (Much may depend on whether Volt buyers are cross-shopping the Prius Prime, and how quickly Toyota expands the Prime’s availability.)

The Chevrolet Bolt continued its steady progress, selling 169 versus the prior month’s 176, and is on pace to dethrone the Tesla Model S as this year’s best-selling battery electric vehicle. (The Tesla Model S held this title in 2013, 2015 and 2016, its reign interrupted by the Nissan Leaf in 2014.)

As for the first-generation Nissan Leaf, it continued its consistent ways with 125 sales in June, level with its five-month average of about 130 units per month.

The Mitsubishi i-MiEV sold a further 6 units in Canada in June. A company representative indicated production will wind down in 2017, with the newest member of the increasingly hyphenated Renault-Nissan-Mitsubishi partnership returning to the Canadian electric vehicle market in 2018 with the Outlander PHEV.